Activitylog fixes

[kobergj]

Fixes multiple small activitylog issues:

• understand ids of format uuid1$uuid2
• return an empty list instead of null when there are no activities.
• return messages even if resource/user/space got removed meanwhile
• delete the document from the store when the corresponding item is purged
• allow sorting result "asc" (default) or "desc" using the "sort" kql parameter

changes. needs reapprove.

[micbar]

Something panics in the CI

goroutine 755 [running]:
github.com/owncloud/ocis/v2/services/activitylog/pkg/service.(*ActivitylogService).RemoveResource(0xc001eac1e0, 0x0)
	/drone/src/services/activitylog/pkg/service/service.go:231 +0x9d
github.com/owncloud/ocis/v2/services/activitylog/pkg/service.(*ActivitylogService).Run(0xc001eac1e0)
	/drone/src/services/activitylog/pkg/service/service.go:108 +0x39d
created by github.com/owncloud/ocis/v2/services/activitylog/pkg/service.New in goroutine 413
	/drone/src/services/activitylog/pkg/service/service.go:89 +0x4c7
2024/06/26 20:57:37 [ociswrapper] oCIS server exited with code 2
2024/06/26 20:57:37 [ociswrapper] Retry starting oCIS server... (retry 1)
2024/06/26 20:57:38 INFO memory is not limited, skipping package=github.com/KimMachineGun/automemlimit/memlimit
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x1736e9d]

[sonarcloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud